Dancing Queen, Mamma Mia and Money, Money Money are just a few of their songs that are still popular today, even if their kooky clothes aren’t.

Jumpsuits — for both the men and the women — sparkling flares, garish glitter and mad make-up were frequently worn by the Swede pop group.

Publishing a revealing book, Abba: The Official Photo Book, to mark the 40th anniversary since they stormed Eurovision with their smash hit Waterloo — the band uncovered their wardrobe secrets.

Abba’s rather fabulous costumes were mainly down to Sweden’s tax laws. The statutes dictate that tax deductions for performers’ clothes could be allowed only if the garments were in no way suitable for everyday wear.

Abba member Bjorn Ulvaeus said: “Nobody can be as badly dressed as we were. In my honest opinion, we looked nuts in those years.”